CN115202137A

CN115202137A - Projection optical system, projection optical module and electronic equipment

Info

Publication number: CN115202137A
Application number: CN202210857218.3A
Authority: CN
Inventors: 桂木大午; 中辻达也; 廖奕翔; 伊藤纪行
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-10-18

Abstract

The application discloses projection optical system, projection optical module and electronic equipment. The projection optical system includes a lens group, a light transmissive pattern member, and a light reflective member. The lens group has an optical axis and comprises at least one lens with a bending force to light rays; the light-transmitting pattern element and the lens are arranged along the direction of the optical axis, and the light rays passing through the light-transmitting pattern element can form a preset pattern; the light reflection element is provided with a reflection surface, the reflection surface and the optical axis form an included angle and reflect light passing through the lens group and the light-transmitting pattern element along the direction of the optical axis, so that the light is emitted out of the cover body along a first preset direction which forms the included angle with the optical axis, and the light can be projected on a projection carrier on one side of the lens group away from the cover body to present preset patterns. The optical axis of the lens group forms an included angle with the direction of the light ray emitted out of the projection optical system, so that the thickness of each element of the projection optical system in the light ray emitting direction is reduced conveniently, and the projection optical system can be installed in a narrow inner space of the electronic equipment.

Description

Projection optical system, projection optical module and electronic equipment

Technical Field

The application relates to the technical field of projection optical modules, in particular to a projection optical system, a projection optical module and electronic equipment.

Background

The shell of the electronic equipment is provided with the dynamically changed light and shadow, so that the appearance of the electronic equipment can be enriched, a novel feeling is brought to people, and the electronic equipment is often more popular with people. Along with the development of electronic equipment, electronic equipment is miniaturized design gradually, and it has great realization degree of difficulty to install optical structure in electronic equipment narrow and small space and realize the light and shadow change.

Disclosure of Invention

The embodiment of the application provides a projection optical system, a projection optical module and electronic equipment, and can solve the problem that an optical structure is difficult to install in the internal space of the electronic equipment.

In a first aspect, an embodiment of the present application provides a projection optical system, configured to be disposed on one side of a cover of an electronic device, where the projection optical system includes:

a lens group for receiving light emitted from the light source, the lens group including at least one lens having a bending force with respect to the light;

the light-transmitting pattern element and the lens are arranged along the optical axis direction of the lens group and are used for enabling light rays passing through the light-transmitting pattern element to form a preset pattern; and

light reflection component, with lens are followed the optical axis direction sets up, light reflection component has the reflection of light face, the reflection of light face with the optical axis is the contained angle and sets up, just the reflection of light face is used for reflecting the edge the optical axis direction passes through the battery of lens with the light of printing opacity pattern component to make light along with the optical axis is the first direction of predetermineeing of contained angle and jets out the lid, thereby can project in the lid is kept away from in order to present on the projection carrier of battery of lens one side predetermine the pattern.

In a second aspect, embodiments of the present application provide a projection optical module including the projection optical system described above.

In a third aspect, an embodiment of the present application provides an electronic device, including the projection optical module as described above.

Based on projection optical system, projection optical module and electronic equipment of this application embodiment, arrange along the optical axis direction of battery of lens through setting up each component of projection optical system, and the optical axis of battery of lens and the direction that light jetted out projection optical system are the contained angle, are convenient for attenuate the thickness of each component of projection optical system in the light outgoing direction, make projection optical system can install in the narrow and small inner space of electronic equipment.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of a projection optical system according to an embodiment of the present application;

FIG. 2 is a schematic perspective view of a lens according to an embodiment of the present application;

fig. 3A is a schematic cross-sectional view of a projection optical system according to an embodiment of the present application in a first predetermined direction;

fig. 3B is a schematic cross-sectional view of a projection optical system according to an embodiment of the present application in a second predetermined direction;

fig. 4A is a schematic cross-sectional view of a projection optical system according to a second embodiment of the present application in a first predetermined direction;

fig. 4B is a schematic cross-sectional view of a projection optical system according to a second embodiment of the present application in a second predetermined direction;

FIG. 5A is a color diagram illustrating an illuminance distribution of a predetermined image on a projection plane according to an embodiment of the present disclosure;

FIG. 5B is a gray-scale image of the illumination distribution of the predetermined image at the projection plane according to the embodiment of the present application;

FIG. 6A is a grid-like color chart of the illumination distribution of a predetermined image on a projection plane according to an embodiment of the present disclosure;

FIG. 6B is a grid-like table gray scale diagram of the illumination distribution of the predetermined image on the projection plane according to the embodiment of the present disclosure;

FIG. 7A is a color diagram of an illuminance distribution of a preset image on a projection plane according to an embodiment of the present disclosure;

FIG. 7B is a gray scale diagram of the illumination distribution of a predetermined image on a projection plane according to the second embodiment of the present disclosure;

FIG. 8A is a grid-like color chart of the illumination distribution of the predetermined image on the projection plane according to the second embodiment of the present disclosure;

fig. 8B is a grid-like tabular gray scale diagram of the illuminance distribution of the preset image on the second projection plane according to the embodiment of the present application.

10. A projection optical system;

100. a lens group; 111. an optical portion; 112. an installation part; 110a, a light incident surface;

l1, a first lens; l2, a second lens; l3, a third lens; l4, a fourth lens; l5, a fifth lens;

101. a projection lens group; 102. a collimating lens group;

11a, a cutting plane; 100a, a first section; 100b, a second section;

200. a light transmissive pattern element; 210. a light-transmitting substrate; 220. a light-transmitting pattern layer;

300. a light reflecting element; 310. a light-reflecting surface; 30a, a light collecting area;

300a, a first surface; 300b, a second surface; 300c, a bevel;

400. a polarizing member;

H. an optical axis; y, a first preset direction; x and a second preset direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

The inventor finds that the shell pattern of the electronic device is designed to dynamically change, and the pattern change area is only limited to the shell of the electronic device. The inventor also finds that if the projection optical system can be combined to project the pattern outside the shell, the light and shadow change forms of the electronic equipment can be greatly enriched. The projection optical system usually needs at least one lens to realize the projection effect, and meanwhile, a light source needs to be configured in the electronic equipment, and light rays emitted by the light source sequentially pass through the projection optical system and the shell to be projected out of the electronic equipment so as to present light and shadow changes. The light source and the projection optical system occupy a large space, and are difficult to be mounted in a narrow internal space of an electronic apparatus. Based on the foregoing, the embodiment of the present application provides a projection optical system, a projection optical module, and an electronic apparatus.

The projection optical system is arranged on one side of a cover body of the electronic equipment, can receive light rays from the light source, changes the light ray propagation direction and projects the light rays to the cover body, and the light rays penetrating through the cover body can be projected to an external object to present a preset pattern.

As shown in fig. 1, which is a schematic perspective view of a projection optical system 10 according to an embodiment of the present disclosure, the projection optical system 10 includes a lens group 100, a light transmissive pattern element 200, and a light reflective element 300. The projection optical system 10 is configured to be mounted on one side of a cover of an electronic device, and light from a light source can pass through the lens group 100, the light-transmissive pattern element 200, and the light-reflective element 300 and then exit the cover to project a pattern; for example, the projection optical system 10 is installed inside the cover so that the light beam can project a pattern toward the outside of the cover after passing through the projection optical system 10.

The lens assembly 100 has an optical axis H, and the lens assembly 100 is used for receiving light emitted by a light source. The lens group 100 includes at least one lens having a bending force with respect to light, and when the number of lenses is plural, the plural lenses are coaxially disposed in the direction of the optical axis H. The lens with the bending force can change the light propagation direction to adjust the coverage of the light passing through the lens group 100 in a plane perpendicular to the optical axis H.

The lens includes a light incident surface 110a and a light emitting surface opposite to each other along the direction of the optical axis H, the light incident surface 110a faces a side where the light source is located to receive the light from the light source, and the light entering the lens from the light incident surface 110a exits the lens from the light emitting surface. The light incident surface 110a and the light emitting surface of each lens are respectively and independently a plane, a convex surface or a concave surface near the optical axis H.

The transparent pattern element 200 and the lens are disposed along the direction of the optical axis H of the lens assembly 100, wherein the transparent pattern element 200 has a transparent area for light to pass through, and the outline of the transparent area forms a predetermined pattern, so that the light passing through the transparent pattern element 200 can form the predetermined pattern.

Light reflecting element 300 and lens set up along the optical axis H direction of lens group 100, light reflecting element 300 has reflection of light face 310, reflection of light face 310 is the contained angle setting with optical axis H, and reflection of light face 310 will follow optical axis H direction and pass through lens group 100 and printing opacity pattern component 200's light reflection, so that light along with optical axis H be the first direction Y of predetermineeing of contained angle and jet out the lid, thereby can project on the projection carrier of keeping away from lens group 100 one side in order to present and predetermine the pattern. The projection carrier may be an object such as a floor, a wall or a table.

When the projection optical system 10 is installed on one side of the cover, the first predetermined direction Y may be the thickness direction of the cover, so that the projection optical system 10 and the light source may be arranged along the direction forming an included angle with the thickness direction of the cover, so as to reduce the cumulative size of the light source and the projection optical system 10 in the thickness direction of the cover, and make it possible to install the projection optical system 10 in a narrow internal space of an electronic device. Meanwhile, there can be more space in the direction forming an included angle with the thickness of the cover body for installing the projection optical system 10 and the light source, so as to adjust the arrangement manner of each element of the projection optical system 10 to obtain a better projection effect, for example, increase the number of lenses in the projection optical system 10, and adjust the distance between two adjacent lenses in the direction of the optical axis H when the number of lenses is multiple.

Optionally, the transmissive pattern element 200 is disposed between the lens set 100 and the light reflective element 300, or the transmissive pattern element 200 is disposed on a side of the lens set 100 facing away from the light reflective element 300, or, when the lens set 100 includes a plurality of lenses, the transmissive pattern element 200 is disposed between two of the lenses.

When the lens group 100 comprises a plurality of lenses, at least part of the lenses form the projection lens group 101. The projection lens assembly 101 is disposed between the transparent pattern element 200 and the light reflection element 300 along the direction of the optical axis H, and the projection lens assembly 101 is configured to receive light emitted from the transparent pattern element 200, deflect the light toward the direction of the optical axis H to reach the reflection surface 310, and emit the light out of the cover in a divergent manner after being reflected by the reflection surface 310, so that the light emitted out of the cover can form a larger pattern on the projection carrier. The light exiting the projection lens assembly 101 is deflected toward the optical axis H, so as to reduce the area covered by the light exiting the projection lens assembly 101 in a plane perpendicular to the optical axis H, and further, the light reflection element 300 having a smaller reflection surface 310 can be selected to receive the light passing through the projection lens assembly 101. In addition, by designing the surface shape of the lens of the projection lens group 101, the light rays exiting the projection lens group 101 are deflected to the optical axis H by a large angle, which is also beneficial to shortening the distance between the projection lens group 101 and the light reflection element 300 in the direction of the optical axis H.

When the lens group 100 comprises a plurality of lenses, optionally, at least a portion of the lenses form the collimating lens group 102. The collimating lens group 102 is disposed between the light source and the transparent pattern element 200 along the direction of the optical axis H, and is configured to receive part or all of the light emitted from the light source, collimate the light emitted from the light source, and transmit the collimated light to the transparent pattern element 200. For example, when the light emitted from the light source is divergent, the collimating lens assembly 102 receives the divergent light generated from the light source, and collimates the divergent light to project the collimated light to the transmissive pattern member 200 at an angle parallel to the optical axis H or approximately parallel to the optical axis H, so as to improve the projection resolution.

When the lens group 100 comprises a plurality of lenses, optionally, a part of the lenses forms the projection lens group 101, and another part of the lenses forms the collimating lens group 102. Optionally, the projection lens group 101 includes at least one lens, and the collimating lens group 100 includes at least one lens.

When the lens group 100 includes a plurality of lenses, at least one of the lenses is a edged lens. As shown in fig. 2, the edge-cut lens includes an optical portion 111 and a mounting portion 112, the optical portion 111 has a bending force on light to change the propagation direction of the light, and the mounting portion 112 is used for connecting with other structural members to mount the lens on the other structural members, for example, the other structural members may be a lens barrel of an optical projection module. Wherein, the trimming lens has at least one cutting plane 11a, and the cutting plane 11a can be formed only on the mounting part 112; alternatively, as shown in fig. 2, the cutting plane 11a is formed on the optical portion 111 and the mounting portion 112, at this time, the size of the predetermined pattern formed by the light passing through the light-transmissive pattern element 200 in the first predetermined direction Y is Y, the size in the second predetermined direction X is X, the second predetermined direction X is perpendicular to the first predetermined direction Y, and Y < X.

Optionally, the edge-cut lens includes two cutting planes 11a, one of the two cutting planes 11a is a first cutting plane 100a, and the other is a second cutting plane 100b, the first cutting plane 100a and the second cutting plane 100b are both parallel to the optical axis H, and the first cutting plane 100a and the second cutting plane 100b are disposed on two opposite sides of the optical axis H along the first preset direction Y, so that the size of the edge-cut lens in the first preset direction Y is smaller. When a part of the lenses form the projection lens group 101, at least one of the lenses forming the projection lens group 101 is a trim lens. When a portion of the lenses form the collimating lens group 100, then at least one of the lenses forming the collimating lens group 100 is a edged lens.

As shown in fig. 3A and 3B, when the lenses of the lens assembly 100 are edge-cut lenses, the first cut surfaces 100a of the edge-cut lenses located on the same side of the optical axis H may be located on the same plane or respectively located on different planes, and the second cut surfaces 100B of the edge-cut lenses located on the same side of the optical axis H may be located on the same plane or respectively located on different planes. Preferably, the cutting planes 11a of the plurality of edge-cutting lenses on the same side of the optical axis H are on the same plane, so that the size of the whole projection optical system 10 in the direction perpendicular to the cutting plane 11a can be reduced, and further, the requirement of the installation space of the projection optical system 10 in the electronic device is reduced, which is beneficial to the thin design of the electronic device.

Optionally, as shown in fig. 4A and 4B, the projection optical system 10 further includes a polarizer 400, the polarizer 400 is disposed between the light source and the lens assembly 100 along the direction of the optical axis H, and the polarizer 400 can adjust the propagation direction of the light emitted by the light source to make the light approach a first plane in which the optical axis H is located in the first preset direction Y, and the first plane is parallel to the first tangent plane 100a. The range of the light emitted from the light source in the first predetermined direction Y is narrowed by the polarizer 400, so as to reduce the size of the lens for receiving the light in the first predetermined direction Y. Moreover, when the light emitted from the light source is divergent light, the light-deflecting element 400 adjusts the light to approach the first plane in the first predetermined direction Y, so that more light can enter the lens assembly 100, thereby reducing light loss.

As shown in fig. 3A, the lens assembly 100 has a light collecting region 30a, a plane of the light collecting region 30a is perpendicular to the optical axis H of the lens assembly 100, and the light passing through the lens assembly 100 is collected in the light collecting region 30a and diffused again after passing through the light collecting region 30a. Optionally, the light-reflecting surface 310 is disposed at the light-collecting region 30a of the lens assembly 100, that is, the light-reflecting surface 310 reflects the light at the light-collecting region 30a, so that the light is emitted out of the cover body in a divergent manner along the first predetermined direction Y, so that the projection optical system 10 of the present application can project a larger predetermined pattern. Meanwhile, the light reflecting surface 310 receives the light passing through the lens assembly 100 at the light collecting region 30a, the area of the light reflecting surface 310 for receiving the light can be designed to be smaller, and correspondingly, the structure of the light reflecting element 300 can also be designed to be smaller.

Optionally, an included angle between the light reflecting surface 310 and the optical axis H of the lens assembly 100 is α, the included angle α is greater than or equal to 30 degrees and less than or equal to 60 degrees, and when the first predetermined direction Y is perpendicular to the optical axis H, the included angle α is 45 degrees.

Alternatively, the light reflecting element 300 includes a first surface 300a, a second surface 300b and an inclined surface 300c, i.e., the light reflecting element 300 is a triangular prism. The first surface 300a is perpendicular to the optical axis H of the lens assembly 100, the first surface 300a faces the lens assembly 100 to receive light passing through the lens assembly 100, the second surface 300b is parallel to the optical axis H and forms an included angle with the first predetermined direction Y, and when the projection optical system 10 is mounted on one side of the cover, the second surface 300b faces the cover. The inclined surface 300c forms an included angle with the optical axis H of the lens assembly 100, and one end of the first surface 300a far from the second surface 300b is connected to one end of the inclined surface 300c, and one end of the second surface 300b far from the first surface 300a is connected to the other end of the inclined surface 300c, so as to connect the inclined surface 300c between the first surface 300a and the second surface 300 b. The light reflection element 300 comprises a first reflective coating layer disposed on the inclined surface 300c, and the first reflective coating layer is connected with the wall surface of the inclined surface 300c to form a light reflection surface 310. The light passing through the lens assembly 100 enters the light reflection element 300 from the first surface 300a and reaches the reflective surface 310, and is reflected by the reflective surface 310 at the reflective surface 310 and then exits the light reflection element 300 from the second surface 300 b.

In other embodiments, the light reflection element 300 may also be a mirror, and optionally, the mirror has a second reflective coating facing the lens group 100, and the surface of the second reflective coating facing the lens group 100 forms the light reflection surface 310. The light passing through the lens assembly 100 directly reaches the reflective surface 310, and is reflected by the reflective surface 310 and then exits along the first predetermined direction Y.

The light transmissive pattern member 200 further has a light blocking region connected to the light transmissive region, and the light blocking region is capable of blocking light. The light-transmitting region of the light-transmitting pattern element 200 can be hollowed out, for example, the light-transmitting pattern element 200 forms a light-transmitting hole at the light-transmitting region, and the outline of the light-transmitting hole forms a predetermined pattern. Alternatively, the portion of the light transmissive pattern member 200 corresponding to the light transmissive region is made of a material that is light transmissive.

Optionally, the light transmissive pattern member 200 includes a light transmissive substrate 210, and the light transmissive substrate 210 is made of a light transmissive material. The light transmissive pattern element 200 further includes a light transmissive pattern layer 220, the light transmissive pattern layer 220 is disposed on the surface of the light transmissive substrate 210, the light transmissive pattern layer 220 is made of a light shielding material corresponding to the light shielding region, and the light transmissive pattern layer 220 is hollowed out or made of a light transmissive material corresponding to the light transmissive region. The transparent substrate 210 may be a transparent film made of PET (Polyethylene terephthalate), PI (Polyimide), PEN (Polyethylene terephthalate) or the like, and the transparent pattern layer 220 is disposed on the surface of the transparent substrate 210 by printing or spraying.

The light-transmissive pattern element 200 and the lens are disposed along the direction of the optical axis H, and the light-transmissive pattern element 200 is located at one side of the lens, so that the light beam can present a predetermined pattern after passing through the light-transmissive pattern element 200 and the lens assembly 100. For example, the transmissive pattern member 200 may be spaced apart from the lenses, or the transmissive pattern member 200 may be attached to a surface of one of the lenses.

In other embodiments, the transmissive pattern element 200 is directly disposed on a surface of one of the lenses, for example, when the projection lens assembly 101 is a plane adjacent to the incident surface 110a of the lens of the collimating lens assembly 100, the transmissive pattern element 200 can be disposed on the incident surface 110a of the lens; alternatively, when the light-emitting surface of the collimating lens assembly 100 adjacent to the lens of the projection lens assembly 101 is a plane, the transmissive pattern element 200 can be disposed on the light-emitting surface of the lens. The light transmissive pattern member 200 may be a light transmissive coating formed on the surface of the lens by a process such as spraying or deposition.

The embodiment of the present application further provides a projection optical module, which is used to be disposed on one side of the cover body of the electronic device, and the projection optical module includes the projection optical system 10 as described above, so that the projection optical module can be installed in a narrow installation space of the electronic device.

The projection optical module further includes a lens barrel having a light-passing hole, and the projection optical system 10 is installed in the light-passing hole. The lens barrel further has a first opening communicated with the light through hole, the first opening is disposed on one side of the projection optical system 10 along a first preset direction Y, the first opening is used for facing the cover body of the electronic device, and the projection optical system 10 disposed in the light through hole is exposed at the first opening, so that the light reflected by the light reflecting surface 310 of the light reflecting element 300 can pass through the first opening and exit the cover body. The lens barrel is provided with a first mounting surface used for facing the cover body, when the lens is the edge cutting lens, a first cutting surface 100a of the edge cutting lens is exposed at the first opening, the first cutting surface 100a is flush with the first mounting surface, and when the projection optical module is arranged on one side of the cover body, the first mounting surface of the lens barrel is connected with the cover body. Further, the portion of the projection optical system 10 exposed at the first opening is also connected to the cover.

Optionally, the lens barrel further has a second mounting surface away from the first mounting surface and a second opening communicated with the light through hole, and the second opening and the first opening are disposed on two opposite sides of the projection optical system 10 along the first preset direction Y, so as to reduce the thickness of the projection optical module in the first preset direction Y. The projection optical system 10 can be exposed at the second opening, for example, the second section 100a of the lens is exposed at the second opening, and the second section 100a is flush with the second mounting surface.

The projection optical module further includes a light source disposed at a side of the lens assembly 100 and the transparent pattern element 200 away from the light reflection element 300, so that light emitted from the light source can pass through the lens assembly 100 and the transparent pattern element 200 and then reach the light reflection element 300. The light source may be an LED lamp that is capable of emitting divergent light.

The embodiment of the application further provides an electronic device, which can be a mobile phone, a tablet computer, a wearable device and the like. The electronic device includes a cover and the projection optical module as described above, the projection optical module is disposed on one side of the cover, for example, the cover may be a battery cover or a front cover of the electronic device. The part of the cover body corresponding to the light source is provided with a heat dissipation layer, so that heat generated by the light source in the light emitting process can be timely dissipated.

The projection optical module of the present application will be described with reference to specific embodiments.

Example one

The projection optical module comprises a projection optical system 10, a lens barrel and a light source, wherein the projection optical system 10 is arranged in a light through hole of the lens barrel, and the light source is an LED lamp and is arranged in the lens barrel corresponding to the projection optical system 10, so that light emitted by the light source can pass through the projection optical system 10.

As shown in fig. 3A and 3B, the projection optical system 10 includes a lens group 100, a transmissive pattern member 200. The lens group 100 includes five lenses having a bending force on light rays, which are a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, which are sequentially arranged along the optical axis H direction, and the five lenses of the lens group 100 are all edge-cutting lenses. The first lens L1 and the second lens L2 form a collimating lens group 100, the third lens L3, the fourth lens L4 and the fifth lens L5 form a projection lens group 101, and the transparent pattern element 200 is disposed between the light-emitting surface of the second lens L2 and the light-incident surface 110a of the third lens L3. The projection lens group 101 has a light collecting region 30a, a light reflecting element 300 (not shown in fig. 3A and 3B) is disposed on the light collecting region 30a, and specifically, a light reflecting surface 310 of the light reflecting element 300 is disposed on the light collecting region 30a. Light from the light source sequentially passes through the first lens L1, the second lens L2, the light transmissive pattern element 200, the third lens L3, the fourth lens L4, and the fifth lens L5 along the optical axis H direction, enters the light reflective element 300 from the first surface 300a of the light reflective element 300 to reach the light reflective surface 310, and is reflected by the light reflective surface 310 and then exits the light reflective element 300 from the second surface 300 b.

The light incident surface S1 of the first lens element L1 is concave at a paraxial region H, and the light emitting surface S2 is convex at the paraxial region H. The light incident surface S3 and the light emitting surface S4 of the second lens element L2 are convex at a position near the optical axis H. The light incident surface S6 of the third lens element L3 is concave at the paraxial region H, and the light emitting surface S7 is convex at the paraxial region H. The light incident surface S8 of the fourth lens element L4 is concave at the paraxial region H, and the light emitting surface S9 is convex at the paraxial region H. The light incident surface S10 and the light emitting surface S11 of the fifth lens element L5 are convex at the paraxial region H.

In table 1, S0 is a light emitting surface of the light source, S1, S3, S6, S8, and S10 are light incident surfaces 110a, S2, S4, S7, S9, and S11 of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, respectively, light emergent surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, S5 is a surface of the light transmissive pattern element 200 facing the second lens L2, S12 is a light reflecting surface 310 of the light reflective element 300, and S13 is a projection surface projected to an external structural member after being reflected by the light reflecting surface 310. R is the radius of curvature of each lens, D is the distance between the centers of two adjacent elements of the projection optical module on the optical axis H, nd is the refractive index (with reference to the light with the wavelength of 587.6 nm), and Vb is the Abbe number (with reference to the light with the wavelength of 587.6 nm).

TABLE 1

According to the parameter D in table 1, the length from the light emitting surface of the light source to the light reflecting surface 310 in the direction of the optical axis H is 21.363mm.

The outline of the predetermined pattern to be projected is rectangular, and the outline of the light-transmitting region of the light-transmitting pattern element 200 is rectangular correspondingly. The light source of the embodiment of the application is an LED lamp, the diameter of the light emitting surface of the LED lamp is 2mm, the included angle between the light emitted by the LED lamp and the optical axis H is 45 degrees, the included angle between the light projected to the light transmitting area of the light transmitting pattern element 200 by the LED lamp and the first preset direction Y is 29.1 degrees, and the included angle between the light projected to the light transmitting area of the light transmitting pattern element and the second preset direction X is 12.9 degrees. In the first predetermined direction Y, the distance from the light reflected by the light reflecting surface 310 of the light reflecting element 300 to the projection surface is a projection distance S, as shown in table 2, which is the length and width of the predetermined pattern projected when the projection distance S is 20cm and 50cm, respectively.

TABLE 2

	Long and long	Width of
			Light-transmitting region of light-transmitting pattern element	0.6mm	2.5mm
Preset image with projection distance of 20cm	56mm	14mm
			Preset image with projection distance of 50cm	140mm	35mm

In this embodiment, the amount of radiation of light emitted by the LED lamp is 2W, the detected radiation illuminance at the preset image position on the projection plane S13 when the projection distance is 50cm is 7.09E-05W/mm ^2, the sum of the detected radiation illuminance and the detected radiation illuminance is 0.354E-05W/mm ^2, the illuminance efficiency at the preset image position on the projection plane S13 is 0.354W, and the illuminance efficiency when the projection distance of the projection optical module is 50cm is 0.354/2 × 100% =17.7%.

As shown in fig. 5A and 5B, the illuminance distribution map of the preset image at the projection plane S13 in the present embodiment is a grid-like table diagram of the illuminance distribution of the preset image at the projection plane S13 in the present embodiment, as shown in fig. 6A and 6B, the abscissa is the length of the preset image at the projection plane S13, and the ordinate is the width of the preset image at the projection plane S13. According to fig. 5A, 5B, 6A, and 6B, it can be seen that the preset image at the projection surface S13 has a better imaging effect.

Example two

The difference between this embodiment and the first embodiment is:

as shown in fig. 4A and 4B, the projection optical system 10 includes a polarizer 400, and the polarizer 400 is disposed between the light source and the first lens L1 in the direction of the optical axis H. The surface of the polarizer 400 facing the light source is a plane, the surface of the polarizer 400 facing away from the light source is a convex surface, and in the first preset direction Y, the light passing through the polarizer 400 approaches the first plane where the optical axis H is located.

In table 3, S0 is a light emitting surface of the light source, S1 is a surface of the light polarizer 400 facing the light source, S2 is a surface of the light polarizer 400 facing away from the light source, S3, S5, S8, S10 and S112 are light incident surfaces 110a, S4, S6, S9, S11 and S13 of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5, respectively, light emergent surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5, S7 is a surface of the light transmissive pattern element 200 facing the second lens L2, S14 is a light reflecting surface 310 of the light reflective element 300, and S15 is a projection surface projected to an external structural component after being reflected by the light reflecting surface 310. Ry is the curvature radius of each lens in the first preset direction Y, rx is the curvature radius of each lens in the second preset direction X, D is the distance between the centers of two adjacent elements of the projection optical module on the optical axis H, nd is the refractive index (with the light with the wavelength of 587.6nm as a reference), and Vb is the Abbe number (with the light with the wavelength of 587.6nm as a reference).

TABLE 3

According to the parameter D in table 3, the length of the light emitting surface of the LED lamp to the light reflecting surface 310 in the direction of the optical axis H is 22.263mm.

In this embodiment, an included angle between the light projected by the LED lamp to the light-transmitting region of the light-transmitting pattern element 200 in the first predetermined direction Y is 31.4 °, and an included angle between the light projected by the LED lamp and the second predetermined direction X is 15.6 °. As shown in table 4, the length and width of the pattern were preset for the projected distances S of 20cm and 50cm, respectively.

TABLE 4

In this embodiment, the detected irradiance at the preset image with the projection distance of 50cm is 7.78E-05W/mm ^2, the sum of the detected irradiance at the preset image of the projection plane is 0.389W, and the illuminance efficiency when the projection distance of the projection optical module is 50cm is 0.398/2 × 100% =19.5%.

As shown in fig. 7A and 7B, the illuminance distribution diagram of the preset image at the projection plane S15 in the present embodiment is a grid-like table diagram of the illuminance distribution of the preset image at the projection plane S15 in the present embodiment, as shown in fig. 8A and 8B, the abscissa is the length of the preset image at the projection plane S15, and the ordinate is the width of the preset image at the projection plane S15. According to fig. 7A, 7B, 8A and 8B, it can be seen that the imaging effect of the preset image at the projection surface S15 is better.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.

The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A projection optical system configured to be disposed on one side of a cover of an electronic device, the projection optical system comprising:

light reflection component, with lens are followed the optical axis direction sets up, light reflection component has the reflection of light face, reflection of light face with the optical axis is the contained angle and sets up, just reflection of light face is used for reflecting the edge the optical axis direction passes through the battery of lens with the light of printing opacity pattern component to make light along with the optical axis is the first direction of predetermineeing of contained angle and jets out the lid, thereby can project in the lid is kept away from in order to present on the projection carrier of battery of lens one side predetermine the pattern.

2. The projection optical system of claim 1, wherein the lens group comprises a plurality of the lenses, some of which form a projection lens group;

the projection lens group is arranged between the light-transmitting pattern element and the light reflection element along the optical axis direction, and is used for receiving light rays emitted by the light-transmitting pattern element and deflecting the light rays towards the optical axis direction so as to project the light rays to the light reflection surface.

3. The projection optical system according to claim 2, wherein another part of the lenses form a collimating lens group;

the collimating lens group is arranged between the light source and the light-transmitting pattern element along the optical axis direction, and is used for receiving part or all of light rays emitted by the light source, collimating the light rays emitted by the light source and transmitting the collimated light rays to the light-transmitting pattern element.

4. The projection optical system of claim 1, wherein the lens is a side-cut lens, the side-cut lens includes a first cut surface and a second cut surface parallel to the optical axis, and the first cut surface and the second cut surface are disposed on opposite sides of the optical axis along the first predetermined direction.

5. The projection optical system according to claim 4, characterized in that the projection optical system further comprises:

a polarizing member disposed between the light source and the lens assembly along the optical axis direction, the polarizing member being capable of adjusting a propagation direction of light emitted from the light source, so that the light is close to a first plane where the optical axis is located in the first preset direction, and the first plane is parallel to the first tangent plane.

6. The projection optical system as claimed in claim 1, wherein the lens group has a light collecting region, the light passing through the lens group is collected in the light collecting region and diffused again after passing through the light collecting region, and the light reflecting surface is disposed at the light collecting region of the lens group.

7. The projection optical system according to claim 1,

the light-transmitting pattern element is positioned on one side of the lens and is arranged at an interval with the lens; or the like, or, alternatively,

the light-transmitting pattern element is attached to one of the lenses.

8. Projection optics module, characterized in that it comprises a projection optics system according to any one of claims 1 to 7.

9. The projection optics module of claim 8 wherein the projection optics module comprises:

the projection optical system is arranged in the light through hole, the first opening is arranged on one side of the projection optical system along the first preset direction, and the projection optical system is exposed at the first opening;

and the light source is arranged on one side of the lens group and one side of the light-transmitting pattern element, which are far away from the light reflection element.

10. An electronic device, comprising:

a cover body; and

the projection optics module defined in any one of claims 8-9, the projection optics module being disposed on a side of the cover.